Abrasive disk



March 16, J FLATQW T AL ABRASIVE DISK Filed Oct. 12, 1936 INVENTORS Joseph Fldion' John Pal/men.

Patented Mar. 16, 1937 UNITED STATES PATENT OFFICE 4 Claims.

This invention relatesto new and useful im provements in an abrasive disk.

The invention has for an object the construc-" tion of an abrasive disk made of buckram, duck or jeans, which is a very strong, tough and flexible backing material.

Another object of the invention is to incorporate in the body of the disk, sheets of strong porous cloth such as buckram, arranged to hold the i material of the disk together even though portions thereof crack or break away.

More specifically, it is contemplated to arrange the strong porous cloth sheets upon the faces of the disk.

Still further the invention proposes so constructing the disk that the porous cloth is vulcanized within its faces. The term "vulcanized as here used is a mongrel expression used to include processes which are not true vulcanization processes but which have become known by the name. For example, there is a material known as vulcanized fiber from which this abrasive disk may be constructed, and which term is a popular commercial name for a product also 5 known as hard fiber or horn fiber. This term vulcanized is a misapplied term in this connection since it implies a rubber compound and no such compound is present in the product.

Still further the invention contemplates that the abrasive material be attached to one side of the disk by the use of a strong adhesive and when so attached it will automatically be attached upon the cloth facing.

A still further object of the invention is to so arrange the cloth of buckram, duck or jeans facings upon the disk that the texture of the outer faces thereof may readily be felt. Consequently,

there is a roughened surface to which an adhesive will readily adhere. The abrasive can therefore be firmly attached directly and indirectly upon the cloth and face of the disk.

Heretofore, attempts have been made to construct abrasive disks which would not break, but invariably after continued use, breakage does and will occur. These abrasive disks must stand abusive use, must flex many times during their life, and materials from which they are constructed become fatigued and break. The main advantage gained by this invention is that the strong cloth protects the material of the disk; first from breaking or cracking, and second, if breakage and cracking does occur, holds the parts from flying and possibly causing injury by striking someone in the face.

For further comprehension of the invention,

and of the objects and advantages thereof, reference will be had to the following description and accompanying drawing, and to the'appended claims in which the various novel features of the invention are more particularly set forth.

In the accompanying drawing forming a material part of this disclosure:-

Fig. 1 is a perspective view of an abrasive disk constructed according to this invention.

Fig. 2 is a fragmentary enlarged sectional view taken on the line 2-2 of Fig. 1.

Fig. 3 is a similar view to Fig. 2, but showing a modified form of the invention.

The abrasive disk, according to this invention, comprises an extremely hard, strong and flexible porous cloth disk l0, preferably of buckram, duck or jeans material. The abrasive i2 is secured upon one of the faces of the disk by adhesive M. This adhesive is first applied on one of the faces of the disk It and then the abrasive is placed thereon.

The disk is formed with a central opening l5 by which it may be mounted on a suitable mandrel of an abrasive machine. A pair of diametrically opposite radial slots I6 extend from the periphery of the opening IS.

The abrasive disk, illustrated in Fig. 3, comprises an extremely hard, strong and flexible disk of hard fiber l0 having sheets I l and II of strong porous cloth vulcanized in both faces thereof and also having abrasive material I2 secured on one of the faces of the disk, The hard fiber disk preferably should be constructed from chemically treated paper made from cotton according to well-known processes for constructing hard fiber. The porous cloth sheets should be vulcanized" into both faces of the disk during the manufacture thereof. The abrasive I2 is secured upon one of the faces of the disk by adhesive M. This adhesive is first applied on one of the faces and then the abrasive is placed thereon. The strong porous cloth sheets II and H preferably should be buckram, duck or leans.

While we have illustrated and described the preferred embodiments of our invention, it is to be understood that we do not limit ourselves to the precise constructions herein disclosed and the right is reserved to all changes and modifications coming within the scope of the invention as defined in the appended claims.

Having thus described our invention, what we claim as new; and desire to secure by United States Letters Patent is:

1. An abrasive disk consisting of an extremely strong, tough and flexible disk of hard fiber having sheets of strong porous cloth vulcanized in both faces thereof, and an abrasive secured on one face of said disk, said cloth being so positioned that its texture may be felt upon conclusion of the vulcanization process.

2. An abrasivedisk consisting of an extremely strong, tough and flexible disk of hard fiber having sheets ofstrong porous cloth vulcanized in both faces thereof, and an abrasive secured on one face of said disk, said disk being formed with a central opening by which it may be mounted on the mandrel of an abrasive machine.

3. An abrasive disk consisting of an extremely strong, tough and flexible disk of hard fiber having sheets of strong porous cloth vulcanized in one of the faces of said disk, porous cloth sheets vulcanized into both faces of said disk to lessen breakage of said disk and to prevent parts flying around if breakage should occur. 1

JOSEPH FLATOW. JOHN PULLMAN. 

